This should have the newer style battery holder. Can you post a picture of the MPU please?
Yes, I would go with NVRAM. NVRAM actually removes the need for batteries on the board. Can you post a better picture angled at the bottom of the battery holder? Need to see if we can tell if the board has corrosion.
Quoted from PinballManiac40:
In case you don't want to attempt installing a socket for the NVRAM, take a 30 minute drive out to Chesterfield, MO to see chrishibler , who would be happy to do it for you.
Maybe he'll sell you one for TMNT as well, which the old RAM is in a socket that you can swap out yourself.
Quoted from McPin54:
Are you saying viniger has no effect alkaline?
This is for my info.
Removing damaged parts and sanding down the solder mask will get to the cancer that is the alkaline.
Read through the link that was supplied by YeOldPinPlayer and you'll see it is much more than work that one reaslizes.
Worse thing one can do is apply any heat to the side of the board that has been hit without sanding the solder mask of the damaged area and then treating it. It will be safe after that time.
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